Abstract
High endothelin (ET) concentrations were recently detected in human bile after orthotopic liver transplantation (OLT). In the present study we compared biliary ET/big-ET levels measured by radioimmunoassay (RIA) in liver graft recipients (n = 37) with levels measured in non-transplant patients during cholecystectomy (n = 38) to clarify the influence of transplantation on the levels of biliary ET peptides. HPLC elution profiles of biliary ET were analyzed for characterization of ET peptide composition and validation of RIA analysis in bile extracts. Mean ET/big-ET levels in the common bile duct after OLT were significantly elevated (ET, 20.9 ± 15; big-ET, 39.2 ± 19 fmol/ml) compared to levels in non-transplant patients (ET, 5.7 ± 4.9; big-ET, 12 ± 8 fmol/ml). Highest ET/big-ET levels were measured in the gall bladder during cholecystectomy (ET, 61.7 ± 41; big-ET, 75 ± 28 fmol/ml). ET and big-ET levels were correlated by linear regression. HPLC analysis reveals the presence of high levels of ET/big-ET in human bile. Biliary ET mostly represents ET-1. High biliary ET levels after OLT appear to be derived from active endothelial secretion and probably reflect hepatic endothelial stress after preservation/ reperfusion. High biliary ET levels could be involved in the mediation of functional cholestatic syndromes after OLT.
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Kraus, T. et al. (1996). Validation of endothelin (ET) immunoreactivity in human bile by HPLC. Comparison of biliary ET concentration in liver transplant recipients with values obtained during cholecystectomy. In: Mühlbacher, F., et al. Transplant International . Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-00818-8_34
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DOI: https://doi.org/10.1007/978-3-662-00818-8_34
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-61024-3
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